GU Old Style Replacement Door Lock Gearbox - 35mm Backset

Upgrade your uPVC door security with the GU Old Style Replacement Door Lock Gearbox. Designed specifically for older GU uPVC door lock mechanisms, this high-quality centre case (gearbox) is built with durable components to ensure long-lasting, reliable performance. It’s the central part of your door’s locking system, responsible for smooth operation and secure locking.

Cost-Effective Door Lock Repair

Replacing the gearbox is a budget-friendly solution compared to replacing the entire multi-point door lock strip, which runs the full length of the door. Ensure your door stays secure without the hassle or expense of a full lock replacement.

Key Features:

• Exact Fit for GU Old Style Locks: Compatible with 35mm backset, 92mm PZ (centres) door locks.
• Reversible Latch: Suitable for both left and right-handed uPVC doors.
• Quick & Easy Installation: Fits seamlessly using your existing screws.
• Common Lock Failure Solution: Often the root cause when a uPVC door lock fails.

Technical Specifications:

• Backset: 35mm
• Centres (PZ Measurement): 92mm
• Compatibility: Only fits GU old style 35mm backset locks—please verify with the product images.
• Included: Full technical diagram available in the image gallery for precise installation guidance.

Before purchasing, double-check that your current gearbox matches the images provided to ensure perfect compatibility.